Under your direction, I'm sure Main Street U.S.A. would have never made it into the park. Let's tear it down because kids just don't care about Meet Me in St. Louis anymore! It appealed to me as a child because it is timeless. Let's also let Adventureland go, how many kids give a damn about Disney's True-Life Adventures or The African Queen. Dr. Livingston, I presume? Pirates? How many pirates movies failed for twenty years? It's a small world? Creepy dolls? No, beloved dolls on a much-parodied but also much beloved attraction.
If anything is happening at MGM Studios (sorry, never gonna change that), it's because it was always a slap-dash affair. It's had an identity crisis since day one. But I would not apply that same rationale across the board. Tomorrowland has had a lot of changes - yep, because it's also had an identity crisis. Same with Future World. Anything dependent on "tomorrow" is going to change.
I just had a talk with my father about all of this. He's in his 80s, if you want to play the age game. He's still teaching middle schoolers three days at week in one of New York's roughest neighborhoods. He said that he feels so liberated to do what his father's generation could not -- and that working/staying active has kept him young. And he has buddies from the airforce who have also kept in good stead like him. He's been fortunate enough to be taken seriously, at his age, when other generations were told to go home and develop a hobby. So, if you think 20 years from now is a factor in wondering what's right for you for the right now... should my father make it to 100, I'm sure he'll still be rocking out.
The only reason I brought up age is because you brought up the death of baby boomers. Well, Walt's been dead now for what, 50 years and change? I think they've done a pretty good job keeping things going without him - while maintaining the central dogma of the company which is, again, nostalgia and progress. The intoxicating drug of the America that never really was isn't going anywhere.